Cylinder-lock.



E. L. TEICH.

CYLINDER LOCK.

APPLIGATIQN FILED APR. 15, 1914.

1,122,816. Patented Dec.29,'1914.

3 SHEETSWSHEET 1.

E. L. TBICH. CYLINDER LOCK. APPLICATION 'FILED APR. 15. 1914.

1,122,816. y Patented 1360.29, 1914.

3 SHEETS-SHEET 2.

'TE 4 i6 19@ 50 9, L z8 18a l 226@ 5717 29 E 7 E G 7816 i0 956; 2 jASTER 22 i3@ S 73 27 f7 28 C O 29 i6 www0/seo I wwe/wko@ oft/mugs 3SHEETS-SHEET a` COA. PHOTCJ-LITHry WASHINUTUNA D V narran srarns raannrernten ERNEST L. TEICH, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO THEAMERICAN HARDWARE CORPORATION, OF NEW BRITAIN, CONNECTICUT, ACORPORATION OF CONNECTICUT.

CYLINDER-LOCK.

Application filed April 15, 1914.

T0 all whom it may concern:

Be it known that I, ERNEST L. TmcH, a citizen of the United States,residing at New Britain, Hartford county, State of Connecticut, haveinvented certain new and vuseful Improvements in Cylinder-Locks, ofwhich the following is a full, clear, and eX- act description.

rlhis invention relates to cylinderI lock construction, and moreparticularly to a construction providing for control through a pluralityof classes of keys including one certain class or key which will operateas a shut-out and as an emergency key as regards the remainder oit' thekeys and the lock. rThese and other features and ad.- Vantages of theinvention are recited in detail in the following specitlcation, taken inconnection with the accompanying drawing forming part thereof andillustrating a preferable embodiment of the invention.

In these drawings: Figure l is a view in elevation of a. lock ofstandard construction having the cylinder lock of the present inventionapplied thereto and cooperating with lthe dead bolt thereof. Fig. 2 is alongitudinal section through the cylinder lock with the plug conditionedfor operation by a key of the first class. Fig. 3 is a View in elevationot the rear tace of the cylinder lock and with the roll-back memberdetached therefrom, showing the relative arrangement and connectionbetween the plug and inner and outer sleeves. Fig. i is a View in endelevation of the rear face oi the cylinder lock with the outer portionof the rollback removed showing the slot in the inner portion oit theroll-back in ooperative relation with the sleeve members and connectingparts, the roll-back being in normal bolt-retracted position. Fig. 5 isa similar View in end elevation with the parts in the position assumedby them when the rollback has been given a revolution in boltprojectlngdirection by a key of the first class. Figs. G, 7 and 8 are respectivelyViews in elevation of the change, master and grand master keys formingwhat l term keys of the i'irs't class Fig. 9 is a View in end elevation,similar to Figs. el and 5, but with the parts in the position theyassume when it is attempted to more the roll-back from thebolt-projected position of Fig 5 in boltretracting direction and by akey of the second class. Figt l0 is a similaryiew of the Specificationof Letters Patent.

Patented Dec. 29, lata..

Serial No. 831,902.

parts inthe position they assume when the rollback has been moved tobolt-projected position by a key of the second class from the retractedposition of Fig. et. Figs. l1 and l2 are views in elevation of thebv"dis play and grand master display keys forming what I term keys ofthe second class Fig. 13 is a' View similar to Figs. 9 and 10 but withthe parts in theposition they assume when it is attempted to move theroll-back trom the projected position of Fig. 10 to retracted positionwith a key olf the iirst class. Fig. la is a view in elevation of what lterm an emergency key forming a key of the third class.

In the drawings I have illustrated a standard type of mortise lockmechanism with which the cylinder lock may cooperate, the necessaryelements for ooperation being merely the dead bolt with its tumblermechanism which is to be operated by the roll-back of the cylinder lock.

l designates the lock case, 2 the face plate and 3 the cover plate ofthe lock case.

l designates the usual latch bolt controlled through a knob spindle, thehub 5 of a knob spindle `being shown.

6 designates a dead bolt of usual construction having a notched upperedge 7 and carrying the pivoted tumbler 8 gated at 9 to cooperate withthefence l0 of the lock case in the usual manner. 4This tumbler has atits rear end the usual operating atleet l1 extending within the notch 7of the dead bolt and in the path of rotation of the rollback of thecylinder lock. .In the form illustrated in the drawings, the tumbler 8is provided with a depending tail portion 1Q positioned to coperate withthe cam end 13 of the thumb turn hub, this hub having roll-back arms ladesigned to engage in a notch 15 in the lower edge of the dead bolt 6 toproject and retract the dead bolt 'from the inner side of the door, asis usual in locks of this class. p

rfhe cylinder lock mechanism ot' the pre. ent invention cooperates withsuch a standard form of dead bolt mechanism by first engaging the offsetll of the tumbler in the usual manner, depressing it to free it from thefence l0, and then engaging the edge ci' the dead bolt to project thedead bolt.I the gate 9 of' the tumbler engaging with the opposits edgeott the fence l0 and holding the bolt against retraction until theroll-back rio of the cylinder lock has been operated in a reversedirection. For the purposes of the present invention the operation ofthe bolt by the thumb turn need not be condead belt mechanism as thedead bolt' and tumbler 8 with their associated parts.

f Projecting movement of the roll-back, therefore, means a revolution ofthe rollback in a clockwise direction, and retracting move- `ment of therollback is in a counter-clockwise direction.

The cylinder lock may comprise the usual f casing 1G which is providedwith an eccentric bore to receive the plug 17 having the y usual keyholeslot therein, the end of this plug extending beyond the rear face of thecasing 16 and being shaped to receive the roll-back as usual. Concentricwith the plug 17 is a short inner sleeve 18, preferably positionedwholly within the ends of .theI casing, A second and concentric or outersleeve 19 inclosesthey first or inner sleeve 18 and the plug 17 and alsois positioned preferablywithin theends of the casing.

19b designates the usual master sleeve.l All of these sleeves and theplug are bored to receive a plurality of spring pressed pin tumblers 2Oof usual construction, these tumblers and their springs being mounted insuitable bores formed in the casing 1G. The lkeys ofthe first class,such as the guest orv change key 21; the master or maids key 22, and thegrand master or housekeepers key 23 are so bitted that when inserted,they will move the pin tumblers 2O upwardly in their bores so that thesetum-y lers will break on the line between the plug 17 and the twosleeves 18 and 19h, and so that the plug 17 alone may be turned by theinserted `key 21 of the first class. rl`he keys of the second class suchas the dis- `play key 2dr and the grand master display key 25 are sobitted that when inserted in the keyhole slot, they will position thetumblers 20 so that they will break on the line between 4the inner andouter sleeves 18-19 and sov that the plug 17 and inner sleeve 18y may beturned together' by the ini 'serted key 24 of the second class. The keysof the third class, such as the emergency key 26 are so bitted that`when inserted in the key hole slot of the plug 17, they will positionthe tumblers 2O to break on the line between the casing 16 and the outeredge of the two sleeves 19 and` 191U so that. when the emergency key 26is inserted and turned, the plug 17 and the inner and outer sleeves18-19--19b will be turned as one.

The rear ends of theV inner and outer sleeves 18-19 are positionedwithin the plane of the rear face ofthe casing 16. The inner sleeve 18carries a pin18a and the outer sleeve 19 carries a similar pin 19aspaced radially therefrom both of these pins projecting into theclearance space at the rear face of the casing, and there beingclearance between these two pins so that one sleeve and its pin mayrotate relative to and past the other sleeve and its pin. The outerfaces of these pins lie preferably within the plane of a boss 16' formedon the rear face of the cylinder casing 1G serving as a bearing for theroll-backs, as'will be later seen. Thatportion of the plug 17 within theplane of the pins 18a and 19a retains its cylindrical form. l/Vithin theclearance space or plane of the pins 18n1 and 191and guiding upon theinner periphery of the casing 16 and the outer periphery of the plug-17is a sliding block or coupling memebr 27, this block spanning theinnerand outer sleeves 18-19 and having extending outwardly from itsrear face and beyond the plane of the sleeve pins and of the bossV 18a,a pin 28.

The roll-back member of the cylinder lock is for convenience made in twoportions or sections. The inner section 29 is shaped to itrover thecut-away end of the plug and bears against the boss 16a of the casing,this section having the usual cam arm 80 and being provided with anarcuate slot 31 therein, the are of the slot being substantiallyco-incident with the arc of vthe outer' sleeve 19, and the are of theslotvbeing substantially less than a semi-circle. The pin 28 of thecoupling member extends out into the plane of this slot 31 so thatwhen'the roll-back is rotated a suflicient distance, theportion of theroll-back at'the ends of the slot will engage with the pin 28 andwillthen move the coupling member27 around withthe roll-l tated, thecoupling member will be caught i up by the roll-back at the end of theslot l keys, these classescorresponding in number to the number ofrotatable elements embodied in the plug 17 and the inner and outersleeves 18 and 19. A key of one class is superior to a key of another orinferior class and serves as a lock-out keyagainst suoli inferior classas well as an emergency key with respect to said inferior class when theparts have been moved to bolt projected position through a key of suchinferior class. The parts so cooperate, however, that when the plug androll-back have been moved to projected position by a key of the firsttwo classes, they must be returned to retracted position by a key ofthat class betorethese parts may be again moved to projected andretracted positions by a key of the other class. A key of the thirdclass an emergency key as to the first and second class keys and canoperate the parts to projected and ret 1acted positions notwithstandingtheir previous projected positions by a key of one of the iirst twoclasses. It, however, the parts have irst been moved to projectedposition by a key of the third class, the subsequent operation of theseparts by keys of the lirst and second classes is absolutely blocked, thekey of the third class operating as an absolute shut-out key. And,before the plug androll-back may be again operated by keys of the irstand second classes, these parts must be returned to iretracted positionby a key of said third class. I #ill now describe in detail theoperation of the rollsback with `the plug and sleeves in connection withthe keys of the various classes.

rlhe normal relation of the parts in bolt retracted position is shown inlTigs. and 4e. At the outset it must be vunderstood `that projectingmovement of th roll-back and its associated parts is in a clockwisedirection, and that retracting movement is in a counter-clockwisedirection.. 1n Fig. 1- it will be seen that the pin 28 of the couplingmember lies closely adjacent one extremity of the slot 31 of theroll-back and that the coupling member abuts the pin 1Q'i of the outersleeve. roll-back independent oi this third sleeve t and, therefore,through the keys of the lirst and second classes) Vis impossible as thepin 19a blocks movement in retracting directhat the key may bewithdrawn.

Retracting .movement of thel tion of the coupling member 27 and as thiscoupling member must perforce rotate with the plug alone through a keyof the iirst class or with the plug and inner sleeve when rotatedtogether by a key of the second class. Assuming that one of the keys 91,22, 23 of the iirst class is inserted in the keyhole slot of the plugwith the parts as shown in E ig. i and the roll-back 30 then moved in aclockwise direction for a full revolution to place the parts inbolt-projected position: The end of the slot 31, removed from the pin9.8 in F ig. Ll, will engage with said pin at the end ot an arc otmovement correspending to the arc of the slot and from that point onwill move the pin and its block 27 around with the roll-back and untilthis coupling block engages with the pin 18'01 on the inner sleeve, itbeing understood, of course, that the inner sleeve 18 and outer l sleeve19 are stationary when ke vvs of the iirst class are moved. rThis willposition the parts as shown in Fig. 5 of the drawings. It` the parts arereturned to bolt retracted position by a key ot this same class, thereverse operation will take place, the parts moving from the positionshown in Fig. 5 to that shown in Fig. 4e, the end of the slot iremovedfrom the pin Q8 in Fig. 5 picking up said pin and its coupling block 27and'moving said block around to abut against the pin 19'a1 of the outersleeve, stopping the partsA in the position shown in Fig. 4f so that thekey may be withdrawn. It', however, with the parts in the bolt'projectedposition of Fig. 5 (the parts being so movedvby a key of the firstclass), it is attempted vto return the parts to bolt retracted positionby a key of the second class, it will be found thatwhile the rollbackmay be moved suiliciently far to retract the bolt, it may not be given acomplete revolution so 'i'his will enable a key oit the second class toretract j the bolt in an emergency `and permit the door to be opened,but the key o1 the second class may not be withdrawn from the slot withthe plug and roll-back in bolt etracted position. The position ot theparte when so moved by a .key of the second class is shown in Fig. 9 ofthe drawings. lVhen such a' key is inserted in the keyhole slot of theplug with the parts as shown in Fig. 5 and the plug and inner sleeve 1Stogether with the roll-back are turned, the pin 1Sa being positionedagainst the coupling block 27, will at once pick up said block and carryit around with the roll-back until said block engages the pin 19a of theouter sleeve. T his will permit a sutlicient rotation ot' the cam arm ofthe roll-back to retract the dead-bolt but prevents the completerevolution of the plug and oi" the roll-back which is necessary topermit the withdrawal of the key from the slot, as will be evident;therefore, even if the key of the second class is used as an emergencykey to obtain temporary access to a room, said key must be operated toreturn the partsv from the position shown in Fig. 9 to that shown inFig. 5 in order that it ymay be withdrawn from the' lock. The relativemovement of these parts during this operatic-n will be evident. f

Before the parts may be moved to bolt retracted and projected positionsby a key of the second class, these parts must be returned from theposition shown in Fig. 5 to that shown in Fig. lby a key of the firstclass as heretofore described. A key of the second class may' then beinserted and turned, the plug and inner sleeve with its pin 18ZL movingtogether and the pin 18a picking up the coupling block 27 after awithdrawn.

short relative' free movement and bringing .the edge of said blockagainst the opposite `side of the pin 19 of the outer sleeve 0r from theposition shown in Fig. et to that shown in Fig. 10. In this position ofthe parts, the roll-back is inbolt projected posi tion and the key ofthe second class may be With the parts in bolt projected positionthrough this key they may not lbe returned to retracted position througha key of the rst class inasmuch as the coupling block is held betweenthe pins 18a and 19:L of the inner and outer sleeves which do notrotate, and inasmuch as the end of the slot 31 will engage with the pin2S after a very short amount of movement and will be stopped by this pin28 which forms a fixed abutment, the parts assuming the position shownin Fig. 13 of the drawings. The

y movement of the parts into projected position-by means of a key of thesecond class will, therefore, sluit out theretraction of the partsfrom'this position `bya key of an inferior class, namely, the firstclass, and it will be evident that the key of the first class must bereversely moved to bring the parts from the position shown in Fig. 13back to the position shown in Fig. 10,where upon the key of the firstclass may be withdrawn, leaving the parts in the bolt projected positionthey assume when actuated by a key of the second class. A key of thesecond class must now be used to move the parts from the position-shownin Fig. 1() to that ,shown in Fig. l before the lock is conditioned forbolt projecting and retracting movement by a key of the first class.

A key of the third class, which is of the type commonly known as anemergency key, forms in effect both a supreme emergency and shut outkey, and when inserted in the keyhole slot will cause the plug 1 7 andinner and outer sleeves 18-19-19b to rotate in unison, thereby 1maintaining the parts always in the position shown in Fig. 4. Asunderthese conditions there can be no relative movement between position andrelation at the end of the projecting movement and will be in theposition shown in Fig. 4L. In this bolt projected position by a key of`thethird class, the parts are absolutely shut out against return toretracted position through keys of thefirst and second classes; Forinstance, the coupling member 27 engages the pin 19a of the outersleeve, and if the roll back and plug are moved by a key of the firstclass, the

adjacent end of the slot 31 will engage the pin 28 and block movementofthe roll-back in retracting direction. .So also if a key of the secondclass is inserted and the. plug and necessary sleeve rotatedy together,the same blocking action will takeplace.` The parts must be returned bya key of the third class to the normal bolt retracted position shown inFig. 4 to retract-the bolt before they can be moved in a clockwisedirection by keys of the first and second classes to move the partstobolt projected position, as heretoforedescribed.

When the roll-back Vand its associated parts have been moved to' boltprojected position` by a -key of either the first or second classes anda key of the third class is used to move the parts in a reversedirection lto retract the bolt, the parts in the *meantime retainingtheir relative positions and being in the bolt projected position of akey of a certainclass (but with the bolt itself in retracted position),it is necessary to again project the bolt by moving the rollback and itsparts in the reverse direction through this key `of the third class.This then conditions the parts for bolt retracting movement through akey of lthe class by which theywere originally moved to projected'`position. Thenthe parts are conditioned for operation by keys of eitherthe first or second classes, itbeing understood that a key of the thirdclass is operative for lbolt projection or retraction under allconsimple form of dead bolt mechanism while giving an extremelywidefrange of control through the construction of thev cylinder lockitself, minimizing the number of parts and the size of the lock case. Apractical use of the cylinder lock may be seen` in the case of anordinary hotel mortise lock such as shown inthe drawings. rlhe guest mayleave the room and project the dead bolt through his change key 2l, thelatter being a key of the first class. Under thesecondi tions, the maidor housekeeper holding keys 22 and 23 respectively may retract the boltand enter the room to perform their neces sary duties, their keys beinglikewise keys of the first class. In the event of emergency, the keys ofthe second class could be utilized to retract the bolt when it had beenpreviously projected by the guest ou leaving the room, although in thislast case these keys of the second class could not be withdrawn from thelock until the door had been closed and the bolt again projected toleave the roll-back and its parts in the position they occupied when theguest witldrew his key. rllhe guest, should he havevaluable goods ondisplay in the room, could, by means of a display key, lock his doorupon leaving and shut out entrance to the room by the maid orhousekeeper through their keys of the first class, as has beenheretofore pointed out in detail. The grand master display key, whichwould be retained by the proprietor or in the oflice, would, of course,givel access to the room, as would the emergency key, which is effectiveat all times. In the specific form of lock shown in the drawings, thedead bolt may be `projected from the interior by means of the thumbturn. In such an event, the bolt would be in projected position with therollback, plug and associated parts in the normal retracted positionshown in Figl of the drawings. Under these conditions the bolt could notbe retracted by keys of either the first or second classes as heretoforeeX- plained, but could be retracted by means of the emergency key, whichcan rotate the roll-back in a counter-clockwise direction to retractthebolt. Therefore, should a guest lock himself in, he isy lsafe fromintrusion from the outside through keys of the first and second classes,but not through keys of the third class which are utilized in the eventof emergency, as suicide or sickness, to gain access to a room when thedead bolt has been'projected from the inside. So, also, as heretoforeexplained, a key of the third class may be used to project the bolt andabsolutely shut out the apartment from access through keys of the 'firstand second classes.

I have herein explained a specific form of cylinder lock mechanism andalso a particular type of dead bolt mechanism with which it maycooperate. I desire it understood, however, that the cylinder lock isnot limited to use with any particular form or dead bolt mechanism andthat the invention itself is not limited to the specific embo-diment ofcylinder lock construction illustrated inthe drawings, but may bemodified in structure and in relative arrangement of parts within thespirit of the invention as dened by the appended claims.

What I claim, therefore, and desire to secure by Letters Patent is:

l. In a cylinder lockra rotatable plug, a roll-back member operativelyconnected therewith and rotated thereby, means oper able by a certainkey for rotating said plug and roll-back through one operating cycle,and means operable by an other certain key for subsequently rotatingsaid parts through a reverse cycle with means for blocking thesubsequent rotation of said parts through the rst named cycle and bythelirst named certain key.

2. In a cylinder lock, a rotatable plug, a roll-back member operativelyconnected therewith and rotated thereby, means operable by a certain keyfor rotating said plug and roll-back through one operating cycle, andmeans operable by an other certain key for subsequently rotating saidparts through a reverse cycle with means for blocking the subsequentrotation of said parts through the first named cycle and by the firstnamed certain key, said blocking means being rendered inoperative by thesubsequent and reverse movement of said parts through the first namedcycle and by the second named certain key.

3. In a cylinder lock, a rotatable plug, a roll-back member operativelyconnected therewith and rotated thereby, means operable by a certain keyfor rotating said plug and roll-back into bolt projecting and retractingpositions, means operable by another key for so rotating said parts withmeans controlled by one of said keys and operative, when said plug androll-back have been previously moved to bolt projecting position by saidkey, to block subsequent movement of said plug and roll-back toretracting position by the other of said keys, said blocking means beingrendered inoperative upon the subsequent movement of said parts back toretracting position by the aforesaid one of said keys.

4. In a cylinder lock, a rotatable plug, a roll-back member operativelyconnected therewith and rotated thereby, means operable by at leastthree different keys for rotating said plug and roll-back through anoperating cycle and including means operable by a certain key forrotating said parts to a bolt projecting position and for blocking theirsubsequent movement to bolt retracting position through an other certainof said keys, said blocking means being controlled by one of said twocertain keys and operative, when said parts have been moved t0,roll-back lsaid projecting position by said key','to block subsequentmovement of said parts to retracting position by the other' certain key,said blocking means being rendered inoperative upon the subsequentreturn of said parte to projecting position by the first mentionedcertain key.

4 5. In a cylinder lock, a rotatable plug, a roll-back memberoperatively connected therewith and rotated thereby, means operable byat least three different keys for rotating said plug and roll-backthrough an operating cycle and including means operable by a certain keyfor rotating said parts to a bolt projecting position and for blockingtheir subsequent movement to bolt re tracting position through anothercertain of said keys, said means being also operable by said firstmentioned key to move said parts to bolt retracting position whenpreviously moved to said bolt projecting position by said other certainkey, said blocking plug and roll-back through one operating cycle, andmeans operable by a key of another of said classes for so rotating saidparts and for rotating said parts through a second and reverse cyclewhen previously moved through said first named cycle by a Ikey or thefirst named class and including means for blocking the subsequent returnof said parts through the first named cycle by a key of the first namedclass, said blocking means being rendered inoperative by the subsequentreturn of said parts through the iirst mentioned cycle by a key o' thesecond mentioned class.

7. In a cylinder lock, a rotatable plug, a member operatively connectedtherewith and rotated thereby, operating means operable by a key ofoneclass for rotating said plug and roll-back into bolt pro- ,jectingand retracting positions, operating means operable by a key of a secondclass for so rotating said parts, said last named operating meansincluding blocking means arranged, when said parts have been first movedto projecting position by a key of said second class, to blocksubsequent return of said parts to retracting position by a key of saidfirst class, said blocking means being rendered inoperative as to keysof said first class by the return of said parts to projecting positionby a key of'said second class, said last named operatmg'means, when saidparts 'have been previously moved to projecting position by a key ofsaid lirst class, being Aoperable by a key of said second class tosecond class, when operated to move the plug and roll-back toboltprojecting position, blocking the retraction of said parts to boltretracting position through the means operable-by said key of said firstclass, said means being in turn operable by saidkey of said second classto retract said plug and roll-back from bolt projecting position whensaid parts have previously been moved to said position by a key of saidfirst class.

9. In a cylinder lock, a rotatable plug, a roll-back .member operativelyconnected therewith and rotated thereby, means operable by a kev or oneclass for rotating said plug and roll-back into bolt projecting andretracting positions, means operable respectively by keys of second andthird classes torso rotating said plug and roll-back, the means operableby the key of said second class, when operated to move the plug androll-back to bolt projecting position, blocking the retraction of' saidparts to bolt retracting position through the means operable by said keyot said first class, said lirst mentioned means being in turn operableby said key of' said second class to. retract said plug androll-backfrom boltprojecting position when said parts have previously been movedto said position by a key of said first class, and a key of said thirdclass being operable to retract said plug and roll-back from boltprojecting position when said parts have been so positionedby-keys ofsaid first or second classes, andbeing operable to block retraction ofsaid plug and roll-back from bolt projecting position by keys of saidfirst or second class when said parts have been moved to bolt projectingposition by a key of said third class. v i

l0. In a cylinder lock, a rotatable plug, a roll-back operatively.connected therewith andi-rotated thereby, means operable' respectivelyby keys of first, second andthird classes respectively for rotating saidplug and roll-back into bolt projecting and retraoting positions7 theoperating means controlled by the keys of the second andV third classesbeing arranged to block bolt retracting movement of said plug androll-back by .a key of the ,first class when said parte have ilo beenmoved to bolt projecting position by a key of a second or third class.

11. In a cylinder lock, a rotatable plug, a

`roll-back operatively connected therewith and rotated thereby, meansoperable respectively by keys of iirst, second and third classes forrotating said plug and roll-back into bolt projecting and retractingpositions, the operating means controlled by the keys of the second andthird classes being arranged to block bolt retracting movement of saidvplug and roll-back by a key of the first class when said parts h vebeen moved to bolt `projecting position by a key of a second or thirdclass, and said operating means, controlled by the keys of second andthird classes respectively, being arranged to move said plug and rollback to bolt retracting position when said parts have been moved to boltprojecting position by keys of said first and second classesrespectively. Y

12. In a cylinder lock, a rotatable plug, a rolleback operativelyconnected therewith and rotated thereby, means operable respectively bykeys of first, second and third classes for rotating said plug androll-back into bolt projecting and retracting positions, the operatingmeans controlled by the keys of the second and third classes beingarranged to block bolt retracting movement of said plug and roll-back bya key of the first class when said parts have been moved to boltprojecting position by a key of a second or third class, and saidoperating means controlled by the keys of second and third classesrespectively, being arranged to move said plug and roll-back to boltretracting position when said parts have been moved to bolt projectingposition by keys of said first and second classes respectively, theoperating means controlled by a key of said third class, when actuatedby a key of that class to position the` plug and roll-back in projectingposition, being arranged to block the return of said parts to retractingposition through keys of said first and second classes. y

13. In a cylinder lock, a casing, a rotatable plug therein having, akeyhole slot, pin tumbler mechanism coperating with said plug, aroll-back member carried by and rotatable with said plug, a sleeve`meinber within said casing inclosing said plug, said tumbler mechanismcoperating With said sleeve member and said plug, a rigid abutmentcarried by said sleeve member, a movable connecting abutment interposedbetween said sleeve labtument and said rollback member, said roll-backand said connector member having a lost motion connection therebetween,said plug and roll-back being rotatable independently of said sleeve bya certain key cooperating with saidtum- -bler mechanism to move saidroll-back and connector block in the direction of said fixed sleeveabutment, and another' key being arranged to rotate said plug, roll-backand sleeve in unison.

leuln a cylinder lock, a casing, a rotatable plug therein, inner andouter sleeve members inclosing said plug, lpin tumbler mechanism4coperating with said sleeve members and With said plug, said tumblermechanism being operable by keys of dif ferent classes to permit'tlieindependent rotation of said sleevermembers and the r0tation of saidplug independently of said sleeve members, annular-ly spaced fixedabutment members carrie-d by said sleeves arranged to rotate inconcentric arcs, with a clearance space therebetween, a coupling memberrotatable about said plug in the plane of said sleeve abutments andbridging the arcuate space therebetween, a rollback carried by said plugand rotating therewith and having a lost motion connection with saidconnector block.

15. ln a cylinder lock, a casing, a rotatable plug therein, inner andouter sleeve members inclosing said plug, pin tumbler mechanismcoperating with said sleeve members and with said plug, said tumblermechanism being operable by keys of difierent classes to permit theindependent rotation of said sleeve members and the rotation of said'plug independently of said sleeve members, annularly spaced fixedabutment members carried by said sleeves arranged to rotate inconcentric arcs With a clearance space therebetween, a coupling memberrotatable about said plug in the plane of said sleeve abntments andbridging the arcuate space therebetween, a roll-back member connected toand rotating with said plug, and a pin and slot connection between saidconnector member and said rollback member permitting limited freemovement between the roll-back and the connector member, said roll-backmoving said connector member against the fixed abutment formed by one ofsaid sleeve studs When said plug or said plug and said inner sleevemember are rotated.

16. ln a cylinder lock, a rotatable plug, a roll-back element inoperative connection therewith` and rotated thereby, key-controlledmeans coperating with said plug formed and arranged for a completerevolution of said plug to one operating cycle of said roll-back, saidmeans being controlled and operable by keys of each of two differentclasses to rotate said plug through a complete revolution in oppositedirections.

17. In a cylinder lock, a rotatable plug', a roll-back element inoperative connection therewith `and rotated thereby, key-con trolledmeans coperating With said plug formed and arranged for a completerevolution of said plug to one operating cycle A' ot said roll-back,said means being conjtrolledand operable by keys of each of tvvo androll-back lin the opposite direction for the reverse cycle through akey'oi" the other oi said classes.

therewith and rotated thereby, key-con trolled means coperating withsaid plug formed and arranged for a complete revolution lof said plug toone operating cycle of said roll-back, said means being conn trolled andoperable by keys of each of two different classes to rotate said plugthrough a complete revolution in opposite directions, said means, whenoperated by a key of one class to give a complete revolution to saidplug in one direction, being only operable for a complete revolution inthe reverse direction by a key of the same class.

19. ln a cylinder lock, a rotatable plug. a roll-back element inoperative connection therewith and rotated thereby, key-controlled meanscoperating with said plug formed and arranged for a complete revolutionof said plug to one operating cycle ot said roll-back, said means beingcontrolled and operable by keys of each ot two different classes-torotate said plug through a complete revolution in opposite directions,said means, when operated by a key ot one Vclass tc give a completerevolution'to said plug in one direction, .being only operable for acomplete revolution in the reverse direction by a key ot the same class.the means controlled by a key of one of said classes being arranged,when operated to rotate said .plug for one cycle oi the roll-back, toblock the operation of said plug and roll-back for the reverse cyclethrough a key of the other of said classes.

20. In a cylinder lock, a rotatable plug, a roll-back element inoperative connection therewith and rotated thereby, key-controlled meanscoperating With said plug constructed and arranged for a completerevolution of said `plug to one operating cycle ot said roll-back, saidmeans being controlled and operable by'keys of each of three differentclassesto rotate said plug through a complete revolution, said means.When operated by a key of each oi tivo of said classes to give acomplete revolution to said plug in one direction, being arranged toblock the operation of said plug by a key voit' the other of saidclasses for a complete revolution in the reverse direction. i

2].. In a cylinder lock, a rotatable plug, a

roll-back element in operative connection therewith and rotated thereby,key-controlled means coperating'rvith said plug constructed andarrangedfor a complete revolution ol. said plug to one operating cyclecit' said roll-back, saidvmeans being `controlled and operable by keysof each' of three dilterent classes to rotate .said plug through acomplete revolution, said means,

Vwhen operatedby a keyot one certain ot said classes to give a completerevolution to through a complete revolution, the means controlled by a.key of the iirst ot said classes, when operated by a key of said tirstclass for a ullrevolution in one direction, being arranged to block theoperation of said plug for a complete revolution in the reversedirection by a keyot the second ot said classes, said means beingarranged to permit complete rotation in said reverse direction by a keyvot' the third of said classes and to permit unrestricted and completerotation in both directions by a key of said third class.

In av cylinder lock, a rotatable plug haring a key-hole slot therein,inner and outer sleeves coi'perating With saidplug. a roll-back carriedby and rotating with said plug, pin tumbler mechanism coperating Withsaid plug and said sleeves kand with three classes of keys, said plugbeing rotatable by keys of each oi. said three classes, said inner andouter sleeves being respectively coupled to and rotated with said plugby keys of second and third classes.

2st. In a cylinder lock, a rotatable plug, a roll-back operativelyconnected therewith and rotated thereby, means operable respectivelybykeys of first, second and third classes for rotating said plug through acomplete revolution` in opposite directions intorbolt projecting andretracting positions respectively, the operating means controlled thereverse direction by a key of said rst class.

25. In a cylinder lock l` a rotatable plug having a key-hole slottherein,finner and outer sleeves coperatng With said plug, Va

roll-back carried by and rotating With said plug, pin tumbler mechanismcoperating with said plug and said sleeves and with three classes ofkeys, said plug being rotatable through a complete revolution to oneoperating cycle of said roll-back by keys of each of said three classes,said inner and outer sleeves being respectively coupled to saidroll-back.

ERNEST L. TEICH. Vitnesses F. G. PARKER, C. A. PARKER.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

